Contributors: 10
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Samuli Konttila |
964 |
79.47% |
1 |
6.25% |
| Dmitry Torokhov |
167 |
13.77% |
4 |
25.00% |
| Mark Brown |
41 |
3.38% |
1 |
6.25% |
| Shubhrajyoti Datta |
21 |
1.73% |
1 |
6.25% |
| Axel Lin |
7 |
0.58% |
3 |
18.75% |
| Dan Carpenter |
5 |
0.41% |
1 |
6.25% |
| Jingoo Han |
3 |
0.25% |
2 |
12.50% |
| James Ketrenos |
2 |
0.16% |
1 |
6.25% |
| Thomas Gleixner |
2 |
0.16% |
1 |
6.25% |
| Lars-Peter Clausen |
1 |
0.08% |
1 |
6.25% |
| Total |
1213 |
|
16 |
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Driver for cypress touch screen controller
*
* Copyright (c) 2009 Aava Mobile
*
* Some cleanups by Alan Cox <alan@linux.intel.com>
*/
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/gpio/consumer.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <asm/byteorder.h>
#define CY8CTMG110_DRIVER_NAME "cy8ctmg110"
/* Touch coordinates */
#define CY8CTMG110_X_MIN 0
#define CY8CTMG110_Y_MIN 0
#define CY8CTMG110_X_MAX 759
#define CY8CTMG110_Y_MAX 465
/* cy8ctmg110 register definitions */
#define CY8CTMG110_TOUCH_WAKEUP_TIME 0
#define CY8CTMG110_TOUCH_SLEEP_TIME 2
#define CY8CTMG110_TOUCH_X1 3
#define CY8CTMG110_TOUCH_Y1 5
#define CY8CTMG110_TOUCH_X2 7
#define CY8CTMG110_TOUCH_Y2 9
#define CY8CTMG110_FINGERS 11
#define CY8CTMG110_GESTURE 12
#define CY8CTMG110_REG_MAX 13
/*
* The touch driver structure.
*/
struct cy8ctmg110 {
struct input_dev *input;
char phys[32];
struct i2c_client *client;
struct gpio_desc *reset_gpio;
};
/*
* cy8ctmg110_power is the routine that is called when touch hardware
* is being powered off or on. When powering on this routine de-asserts
* the RESET line, when powering off reset line is asserted.
*/
static void cy8ctmg110_power(struct cy8ctmg110 *ts, bool poweron)
{
if (ts->reset_gpio)
gpiod_set_value_cansleep(ts->reset_gpio, !poweron);
}
static int cy8ctmg110_write_regs(struct cy8ctmg110 *tsc, unsigned char reg,
unsigned char len, unsigned char *value)
{
struct i2c_client *client = tsc->client;
int ret;
unsigned char i2c_data[6];
BUG_ON(len > 5);
i2c_data[0] = reg;
memcpy(i2c_data + 1, value, len);
ret = i2c_master_send(client, i2c_data, len + 1);
if (ret != len + 1) {
dev_err(&client->dev, "i2c write data cmd failed\n");
return ret < 0 ? ret : -EIO;
}
return 0;
}
static int cy8ctmg110_read_regs(struct cy8ctmg110 *tsc,
unsigned char *data, unsigned char len, unsigned char cmd)
{
struct i2c_client *client = tsc->client;
int ret;
struct i2c_msg msg[2] = {
/* first write slave position to i2c devices */
{
.addr = client->addr,
.len = 1,
.buf = &cmd
},
/* Second read data from position */
{
.addr = client->addr,
.flags = I2C_M_RD,
.len = len,
.buf = data
}
};
ret = i2c_transfer(client->adapter, msg, 2);
if (ret < 0)
return ret;
return 0;
}
static int cy8ctmg110_touch_pos(struct cy8ctmg110 *tsc)
{
struct input_dev *input = tsc->input;
unsigned char reg_p[CY8CTMG110_REG_MAX];
memset(reg_p, 0, CY8CTMG110_REG_MAX);
/* Reading coordinates */
if (cy8ctmg110_read_regs(tsc, reg_p, 9, CY8CTMG110_TOUCH_X1) != 0)
return -EIO;
/* Number of touch */
if (reg_p[8] == 0) {
input_report_key(input, BTN_TOUCH, 0);
} else {
input_report_key(input, BTN_TOUCH, 1);
input_report_abs(input, ABS_X,
be16_to_cpup((__be16 *)(reg_p + 0)));
input_report_abs(input, ABS_Y,
be16_to_cpup((__be16 *)(reg_p + 2)));
}
input_sync(input);
return 0;
}
static int cy8ctmg110_set_sleepmode(struct cy8ctmg110 *ts, bool sleep)
{
unsigned char reg_p[3];
if (sleep) {
reg_p[0] = 0x00;
reg_p[1] = 0xff;
reg_p[2] = 5;
} else {
reg_p[0] = 0x10;
reg_p[1] = 0xff;
reg_p[2] = 0;
}
return cy8ctmg110_write_regs(ts, CY8CTMG110_TOUCH_WAKEUP_TIME, 3, reg_p);
}
static irqreturn_t cy8ctmg110_irq_thread(int irq, void *dev_id)
{
struct cy8ctmg110 *tsc = dev_id;
cy8ctmg110_touch_pos(tsc);
return IRQ_HANDLED;
}
static void cy8ctmg110_shut_off(void *_ts)
{
struct cy8ctmg110 *ts = _ts;
cy8ctmg110_set_sleepmode(ts, true);
cy8ctmg110_power(ts, false);
}
static int cy8ctmg110_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct cy8ctmg110 *ts;
struct input_dev *input_dev;
int err;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_READ_WORD_DATA))
return -EIO;
ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL);
if (!ts)
return -ENOMEM;
input_dev = devm_input_allocate_device(&client->dev);
if (!input_dev)
return -ENOMEM;
ts->client = client;
ts->input = input_dev;
snprintf(ts->phys, sizeof(ts->phys),
"%s/input0", dev_name(&client->dev));
input_dev->name = CY8CTMG110_DRIVER_NAME " Touchscreen";
input_dev->phys = ts->phys;
input_dev->id.bustype = BUS_I2C;
input_set_capability(input_dev, EV_KEY, BTN_TOUCH);
input_set_abs_params(input_dev, ABS_X,
CY8CTMG110_X_MIN, CY8CTMG110_X_MAX, 4, 0);
input_set_abs_params(input_dev, ABS_Y,
CY8CTMG110_Y_MIN, CY8CTMG110_Y_MAX, 4, 0);
/* Request and assert reset line */
ts->reset_gpio = devm_gpiod_get_optional(&client->dev, NULL,
GPIOD_OUT_HIGH);
if (IS_ERR(ts->reset_gpio)) {
err = PTR_ERR(ts->reset_gpio);
dev_err(&client->dev,
"Unable to request reset GPIO: %d\n", err);
return err;
}
cy8ctmg110_power(ts, true);
cy8ctmg110_set_sleepmode(ts, false);
err = devm_add_action_or_reset(&client->dev, cy8ctmg110_shut_off, ts);
if (err)
return err;
err = devm_request_threaded_irq(&client->dev, client->irq,
NULL, cy8ctmg110_irq_thread,
IRQF_ONESHOT, "touch_reset_key", ts);
if (err) {
dev_err(&client->dev,
"irq %d busy? error %d\n", client->irq, err);
return err;
}
err = input_register_device(input_dev);
if (err)
return err;
i2c_set_clientdata(client, ts);
return 0;
}
static int __maybe_unused cy8ctmg110_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct cy8ctmg110 *ts = i2c_get_clientdata(client);
if (!device_may_wakeup(&client->dev)) {
cy8ctmg110_set_sleepmode(ts, true);
cy8ctmg110_power(ts, false);
}
return 0;
}
static int __maybe_unused cy8ctmg110_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
struct cy8ctmg110 *ts = i2c_get_clientdata(client);
if (!device_may_wakeup(&client->dev)) {
cy8ctmg110_power(ts, true);
cy8ctmg110_set_sleepmode(ts, false);
}
return 0;
}
static SIMPLE_DEV_PM_OPS(cy8ctmg110_pm, cy8ctmg110_suspend, cy8ctmg110_resume);
static const struct i2c_device_id cy8ctmg110_idtable[] = {
{ CY8CTMG110_DRIVER_NAME, 1 },
{ }
};
MODULE_DEVICE_TABLE(i2c, cy8ctmg110_idtable);
static struct i2c_driver cy8ctmg110_driver = {
.driver = {
.name = CY8CTMG110_DRIVER_NAME,
.pm = &cy8ctmg110_pm,
},
.id_table = cy8ctmg110_idtable,
.probe = cy8ctmg110_probe,
};
module_i2c_driver(cy8ctmg110_driver);
MODULE_AUTHOR("Samuli Konttila <samuli.konttila@aavamobile.com>");
MODULE_DESCRIPTION("cy8ctmg110 TouchScreen Driver");
MODULE_LICENSE("GPL v2");